Why hasn’t Obama acted on murders in Chicago?

Why doesn’t Obama act on murders in Chicago?

Since President Obama was first elected to the United States Senate in 2004 there have been nearly 4,000 murders in his home city of Chicago.  During his first 4 years as President there were nearly 1,800 murders. But there was no action on gun control until the recent rash of suburban shootings in Colorado, Oregon and Connecticut. Why do you feel there has been a failure to act on urban crime in America during this administration?